Engine Noise problems of the 2006 Chrysler 300C

I was getting off work. Stopped by my barbershop to get a haircut, than planned on heading home. But I received a phone call from my wife to pick up a few things before I got home. I was in the store for about 15 minutes. The was running great. No over heating issue or nothing. Temp gauge was at it normal operation temp. I'm out of the store in the car trying to start it up. But getting nothing. But when it does start I hear alot of engine noise. So I shut it down and have it towed to my home. Had a friend of mines who works on cars come check it out. Than he tells me I need a new motor due to valve seat had dropped.

In August of 2012 my vehicle had around 76,000 miles and it was the first time I experience my vehicle stalling out and turning off while driving at around 30mphs, I pulled over and tried restarting my vehicle and notice there was loss of power and engine was behaving abnormal. I turned it off and restarted after a few minutes and that's when I hard a loud metallic engine noise. I had my car towed to puente hills Chrysler dealer and they told me I had no compression in a few cylinders, due to their bad customer service I had my vehicle towed to an independent shop that told me this was a common issue with all Chrysler and Dodge vehicle's with the 5. 7l engines. After diagnosing and taking the valve covers off they found the valve seats had dropped and bent the valves. Total cost was $3,500. Now, November 28, 2013 with 100,995 miles on my vehicle, same thing happened again, vehicle stalled at around 10mphs and once again when trying to restart heard the metallic noise coming from the engine area. This time they are charging me $4,000 to have it fix.

I was driving along @ 45mph approaching a stop light and the 5. 7l hemi engine started to make a noise that sounded like something got stuck in the fan. Upon further investigation the problem was in the left bank cylinder head. After removing the head and inspecting the valve seats no# 1 intake valve seat was missing. After taking a closer look at the valve seats it was noticed that small bits and pieces were crumbling off of the other seats. Following this I have done some research on this problem and find it to be quite common with the 5. 7 engine. The main safety problem here is that if one loses a valve seat then a valve can potentially be lost and cause catastrophic engine failure. At highway speeds this could be a very bad thing. There are two problems here. Chrysler is using a compressed medal valve seat that does not hold up under the stress of the engine as it ages and the second is that the valve seat is not sunk deep enough into the head I. E. The head does not have enough gripping surface to hold the valve seat in place. And yes I am an engineer!.